Blue-flame oil-burner.



R. HOFFMAN.

BLUE FLAME OIL BURNER.

APPLICATION FILED JAN-'1. 1915.

L1 88,780. Patented June 27, 1916.

29 28 6 5 F W j THE COLUMBIA PLANOGRAPH c0., WASHINGTON, n. c.

IIEITIQD STATES PATENT I lEQE.

RUDOLPH HOFFMAN, OF CHICAGO HEIGHTS, ILLINGIS, ASSIGIIOB, TO SEARS, ROEBUCI AND COMPANY, OF CHICAGO, ILLINOIS, A CQItPOBATION OF NEW YORK.

BLUE-FLAME OIL-BURNER.

Application filed January 7, 1915.

To all whom it may concern lie it known that I, Ruoonrn Horimiuv, a citizen of the United States, residing at Chicago Heights, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Blue- Flame Oil-Burners, of which the following is a specification.

This invention relates more particularly to improvements in the type of burner shown in Patent No. 1,092,262, granted April 7, 191%, the features of improvements being pointed out hereinafter.

In the accompanying drawings, Figure 1 is a fragniental vertical central section through a burner embodying the features of my invention. Fig. 2 is a view taken sul stantially in the plane of dotted line 2--2 of Fig. 1. Fig. 3 is a fragmental view of an alternative construction.

The body 1 of the burner comprises an inner wick tube 2 and an outer wick tube 8, said tubes forming an annular space to re ceive a wick i. In the construction herein illustrated, the outer wick tube terminates in a. horizontal plane slightly below the plane of the top of the inner wick tube, and the upper ends of the wick tubes are preferably bent inwardly slightly, as shown. Air is admitted to the inner and outer sides of the annular flame produced by the wick, the air being controlled by an inner air controller and an outer air controller. In the form herein shown, the inner air controller 5 is of generally frusto-conical form, the larger upper end-of the controller being located adjacent to the plane of the upper end of the inner wick tube. Above the plane of the largest diameter of the inner air con troller is an annular flange (5 which first extends inwardly and upwardly and then outwardly. A disk 7 extends transversely in the inner air controller in the plane of the largest diameter of said controller. In said disk and in the lower end of the air controller 5 are formed alined openings 7' and 5 respectively.

The inner air controller is herein shown as loosely supported concentrically with the wick tube upon the cupped member or ring 8, said ring being supported within the body 1 by means of a spider 9. The spider 9 may, if desired, be formed of two sheet-metal cross-bars intersecting each other at right angles, the ends of said bars being secured Specification of Letters Patent.

Serial No. 912.

to the inner wick tube by means of solder or in any other suitable manner. In order to maintain the truecircular form of the inner wick tube 2, I provide a ring 2 fitting tightly within and extending transversely of said wick tube. The ring 2 extends through slots 9 in the spider 9.

The ring 8 has an outwardly extending annular flange 8 which causes the air current to flow upwardly close to the inner wick tube, said air current carrying up any vapors which might otherwise flow down and condense on said tube.

In the present embodiment, the outer air controller 11 is of annular form and is removably mounted upon the body 1. The means for siu iporting the outer air controller upon the body 1 comprises an annular imperforate horizontal flange 12 rigidly secured upon and encircling the outer wick tube. The flange 12 has a vertical annular flange 1% which is provided with locking projections 15 upon its upper edge. The upper end of each of said projections 15 is rounded to facilitate the entrance of the projections into locking slots to be hereinafter mentioned. Each projection comprises a locking shoulder 16.

The outer air controller 11 comprises an annular ring19having a shoulder 20 to support the chimney (not shown). Attached to the lower portion of the ring 19 is an annular inwardly extending flange 22 having perforations 23 therein. At the innor edge of the flange 22 is a downwardly and outwardly inclined flange 24L, the lower edge of which is adapted to rest removably upon the flange 12. The flange 24 has an upwardly bent annular portion 24 which fits within the flange let. In the flange 2 1 are perforations 2 1- for the admission of air to the space between the outer wick tube and the flange 2 1.

At the inner edge of the flange 22 is an upwardly extending annular flange 26 encircling the outer wick tube and spaced a short distance therefrom in order to provide a restricted air passage 26 between the outer wick tube and said flange. The lower end of said passage communicates with the atmosphere through the perforations 24 In order to restrict the flow of air upwardly through said passage, there may be placed in said passage, as herein shown, aring 27 having corrugations extending vertically thereof. The air current in the passage 26 prevents vapor from flowing down the outer wick tube and condensing. The upper end of the annular flange 26 extends above the horizontal plane of the top of the inner wick tube.

The outer air controller 11 further comprises two inwardly extending flanges 28 and 29 which are connected to the ring 19. The inner portions of the flanges 2S and 29 overhang the wick space. These flanges have between them an air passage 30 through which air is directed in a downwardly inclined sheet against the flame. Air is admitted to said passage through perforations 31 in the flange 29. Air is admitted to the flame through the space 32 between the flanges 20 and 29 through the perforations in the flange 22.

The parts of the burner are so designed and proportioned that the amount oil air supplied through the passages 26, 30 and 32 and the space between the inner wick tube and the inner air controller 5 is such that a blue flame is produced.

It is important that the flange 29 be located at a definite distance from the upper end of the flange 26. It also is important that the inner edge of the flange 29 be lo cated at a definite distance from the upper end of the inner wick tube. To attain these results, I have provided a spacing device interposed between the flanges 22 and 29, said spacing device, in the present embodi ment, comprising a ring 35 having an angular flan ge36 that rests upon the flange 22. Rising from the ring 35 are projections 37 which extend into contact with the flange 29. The flange 22 is provided with a suitable number of elongated openings 25 to receive the locking projections 15.

When the burner is to be lighted, the operator applies a match to the wick, the inner controller 5 being'tilted upon its seat 8, if desired. When it is necessary to trim or replace the wick l, the outer air controller 11 is turned until the flange 22 is clear of the locking shoulder 16, the controller 1'1. being then lifted ofl"- the wick tube. After the wick has been trimmed or renewed, the air controller 11 is replaced, the rounded upper ends of the projections 15' guiding said projections into the slots \Vhen the flange 2 lrests upon the flange 12, the air controller 11 is turned by the operator in the direction to carry a portion of the flange 22 beneath each of the locking shoulders 16.

Fig. 3 illustrates an alternative construction wherein a reentrant bead 26 is formed upon the upper portion of the flange 26, said bead being located above the corrugated ring 27, and above the outer wick tube The bead 26 serves to deflect or direct the air ascending through the passage 26 toward the flame, thereby somewhat increasing the size of the flame.

I claim as my invention:

1. In a blue-flame oil burner, two concentric wick tubes forming an annular wick space, an inner air controller, an outer air controller, said outer air controller comprising an annular inwardly extending supporting flange, an annular air-directing flange, the inner edge of which is adjacent to the upper end of the inner wick tube, and an annular ring withvertical projecting lugs engaging the lower side of said air-directing flange for Spacing said flange at a definite distance from the inner wick tube.

2. In a blue-flame oil burner, two concentric wick tubes fori'ning an annular wick space, an inner air controller, an outer air controller, said outer air controller comprising an annular vertical flange encircling the outer wick tube, and two annular superposed flanges located above said flange, and means for spacing the lower flange at a definite distance from the upper end of said vertical flange. v

3. In a blue-flame oil burner, the combination of two concentric wick tubes forming a wick space therebetween, means for controlling the supplyot air to the inner side of the flame, and means for controlling the supply of air to the outer side of the flame, the last mentioned means comprising a vertical ring, an annular inwardly extending flange attached to said ring, a vertical flange connected to the inner portion of said flange, said vertical flange extending above the plane of the outer wick tube and forming an air passage between said vertical flange and the outer wick tube, two inwardly extending flanges, one above the other and both lo cated above said vertical flange for directing a sheet of air against the outer side of the flame, and spacing means interposed between the flrst mentioned flange and the lower one oi the two'inwardly extending flanges for spacing said lower flange at a definite distance from the inner wick tube and said vertical flange.

In testimony whereof, I hereunto set my hand in the presence of two witnesses.

RUDOLPH HOFFMAN.

In presence ot' E. II. SIEKMANN,

W. F. IVIEHL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

. Washington, D. 0. 

